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[gnome-photos] Add PhotosTrackerController

commit bc9e570f115cb2e40814a6576dc39b04bbcb0ea0
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri May 4 00:39:41 2012 +0200

    Add PhotosTrackerController

 src/Makefile.am                 |    2 +
 src/photos-tracker-controller.c |  366 +++++++++++++++++++++++++++++++++++++++
 src/photos-tracker-controller.h |   75 ++++++++
 3 files changed, 443 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 68df3b9..61e9433 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -67,6 +67,8 @@ gnome_photos_SOURCES = \
 	photos-source.h \
 	photos-source-manager.c \
 	photos-source-manager.h \
+	photos-tracker-controller.c \
+	photos-tracker-controller.h \
 	photos-tracker-queue.c \
 	photos-tracker-queue.h \
 	photos-utils.c \
diff --git a/src/photos-tracker-controller.c b/src/photos-tracker-controller.c
new file mode 100644
index 0000000..eb3f4d5
--- /dev/null
+++ b/src/photos-tracker-controller.c
@@ -0,0 +1,366 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "photos-item-manager.h"
+#include "photos-offset-controller.h"
+#include "photos-query-builder.h"
+#include "photos-source-manager.h"
+#include "photos-tracker-controller.h"
+#include "photos-tracker-queue.h"
+
+
+struct _PhotosTrackerControllerPrivate
+{
+  GCancellable *cancellable;
+  PhotosBaseManager *item_mngr;
+  PhotosBaseManager *src_mngr;
+  PhotosOffsetController *offset_cntrlr;
+  PhotosQuery *current_query;
+  PhotosTrackerQueue *queue;
+  gboolean is_started;
+  gboolean query_queued;
+  gboolean querying;
+  gint query_queued_flags;
+  gint64 last_query_time;
+};
+
+enum
+{
+  QUERY_STATUS_CHANGED,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
+
+G_DEFINE_TYPE (PhotosTrackerController, photos_tracker_controller, G_TYPE_OBJECT);
+
+
+typedef enum
+{
+  PHOTOS_TRACKER_REFRESH_FLAGS_NONE = 0,
+  PHOTOS_TRACKER_REFRESH_FLAGS_RESET_OFFSET = 1 << 0
+} PhotosTrackerRefreshFlags;
+
+static void photos_tracker_controller_refresh_internal (PhotosTrackerController *self, gint flags);
+static void photos_tracker_controller_set_query_status (PhotosTrackerController *self, gboolean query_status);
+
+
+static void
+photos_tracker_controller_query_finished (PhotosTrackerController *self, GError *error)
+{
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  photos_tracker_controller_set_query_status (self, FALSE);
+
+  /* TODO: print error,
+   *       photos_offset_controller_reset_count (priv->offset_cntrlr)
+   */
+
+  if (priv->query_queued)
+    {
+      priv->query_queued = FALSE;
+      photos_tracker_controller_refresh_internal (self, priv->query_queued_flags);
+    }
+}
+
+
+static void
+photos_tracker_controller_cursor_next (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosTrackerController *self = PHOTOS_TRACKER_CONTROLLER (user_data);
+  PhotosTrackerControllerPrivate *priv = self->priv;
+  TrackerSparqlCursor *cursor = TRACKER_SPARQL_CURSOR (source_object);
+  gboolean valid;
+  gint64 now;
+
+  valid = tracker_sparql_cursor_next_finish (cursor, res, NULL); /* TODO: use GError */
+  if (!valid)
+    {
+      tracker_sparql_cursor_close (cursor);
+      photos_tracker_controller_query_finished (self, NULL);
+      g_object_unref (cursor);
+      g_object_unref (self);
+      return;
+    }
+
+  now = g_get_monotonic_time ();
+  g_debug ("Query Cursor: %" G_GINT64_FORMAT, (now - priv->last_query_time) / 1000000);
+
+  photos_item_manager_add_item (PHOTOS_ITEM_MANAGER (priv->item_mngr), cursor);
+  tracker_sparql_cursor_next_async (cursor,
+                                    priv->cancellable,
+                                    photos_tracker_controller_cursor_next,
+                                    self);
+}
+
+
+static void
+photos_tracker_controller_offset_changed (PhotosOffsetController *offset_cntrlr, gint offset, gpointer user_data)
+{
+}
+
+
+static void
+photos_tracker_controller_query_executed (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosTrackerController *self = PHOTOS_TRACKER_CONTROLLER (user_data);
+  TrackerSparqlConnection *connection = TRACKER_SPARQL_CONNECTION (source_object);
+  GError *error;
+  TrackerSparqlCursor *cursor;
+
+  error = NULL;
+  cursor = tracker_sparql_connection_query_finish (connection, res, &error);
+  if (error != NULL)
+    {
+      photos_tracker_controller_query_finished (self, error);
+      g_error_free (error);
+      return;
+    }
+
+  tracker_sparql_cursor_next_async (cursor,
+                                    self->priv->cancellable,
+                                    photos_tracker_controller_cursor_next,
+                                    g_object_ref (self));
+}
+
+
+static void
+photos_tracker_controller_perform_current_query (PhotosTrackerController *self)
+{
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  if (priv->current_query != NULL)
+    photos_query_free (priv->current_query);
+
+  priv->current_query = photos_query_builder_global_query ();
+  g_cancellable_reset (priv->cancellable);
+
+  photos_tracker_queue_select (priv->queue,
+                               priv->current_query->sparql,
+                               priv->cancellable,
+                               photos_tracker_controller_query_executed,
+                               g_object_ref (self),
+                               g_object_unref);
+}
+
+
+static void
+photos_tracker_controller_refresh_for_object (PhotosBaseManager *manager, GObject *object, gpointer user_data)
+{
+}
+
+
+static void
+photos_tracker_controller_set_query_status (PhotosTrackerController *self, gboolean query_status)
+{
+  PhotosTrackerControllerPrivate *priv = self->priv;
+  gint64 now;
+
+  if (priv->querying == query_status)
+    return;
+
+  now = g_get_monotonic_time ();
+  if (query_status)
+    priv->last_query_time = now;
+  else
+    {
+      g_debug ("Query Elapsed: %" G_GINT64_FORMAT, (now - priv->last_query_time) / 1000000);
+      priv->last_query_time = 0;
+    }
+
+  priv->querying = query_status;
+  g_signal_emit (self, signals[QUERY_STATUS_CHANGED], 0, priv->querying);
+}
+
+
+static void
+photos_tracker_controller_refresh_internal (PhotosTrackerController *self, gint flags)
+{
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  priv->is_started = TRUE;
+
+  if (flags & PHOTOS_TRACKER_REFRESH_FLAGS_RESET_OFFSET)
+    photos_offset_controller_reset_offset (priv->offset_cntrlr);
+
+  if (photos_tracker_controller_get_query_status (self))
+    {
+      g_cancellable_cancel (priv->cancellable);
+      priv->query_queued = TRUE;
+      priv->query_queued_flags = flags;
+      return;
+    }
+
+  photos_tracker_controller_set_query_status (self, TRUE);
+  photos_base_manager_clear (priv->item_mngr);
+  photos_tracker_controller_perform_current_query (self);
+}
+
+
+static void
+photos_tracker_controller_source_object_added (PhotosBaseManager *manager, GObject *object, gpointer user_data)
+{
+}
+
+
+static void
+photos_tracker_controller_source_object_removed (PhotosBaseManager *manager, GObject *object, gpointer user_data)
+{
+}
+
+
+static GObject *
+photos_tracker_controller_constructor (GType type,
+                                       guint n_construct_params,
+                                       GObjectConstructParam *construct_params)
+{
+  static GObject *self = NULL;
+
+  if (self == NULL)
+    {
+      self = G_OBJECT_CLASS (photos_tracker_controller_parent_class)->constructor (type,
+                                                                                   n_construct_params,
+                                                                                   construct_params);
+      g_object_add_weak_pointer (self, (gpointer) &self);
+      return self;
+    }
+
+  return g_object_ref (self);
+}
+
+
+static void
+photos_tracker_controller_dispose (GObject *object)
+{
+  PhotosTrackerController *self = PHOTOS_TRACKER_CONTROLLER (object);
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  g_clear_object (&priv->item_mngr);
+  g_clear_object (&priv->src_mngr);
+  g_clear_object (&priv->offset_cntrlr);
+  g_clear_object (&priv->queue);
+
+  G_OBJECT_CLASS (photos_tracker_controller_parent_class)->dispose (object);
+}
+
+
+static void
+photos_tracker_controller_finalize (GObject *object)
+{
+  PhotosTrackerController *self = PHOTOS_TRACKER_CONTROLLER (object);
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  if (priv->current_query != NULL)
+    photos_query_free (priv->current_query);
+
+  G_OBJECT_CLASS (photos_tracker_controller_parent_class)->finalize (object);
+}
+
+
+static void
+photos_tracker_controller_init (PhotosTrackerController *self)
+{
+  PhotosTrackerControllerPrivate *priv;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, PHOTOS_TYPE_TRACKER_CONTROLLER, PhotosTrackerControllerPrivate);
+  priv = self->priv;
+
+  priv->cancellable = g_cancellable_new ();
+  priv->item_mngr = photos_item_manager_new ();
+
+  priv->src_mngr = photos_source_manager_new ();
+  g_signal_connect (priv->src_mngr,
+                    "object-added",
+                    G_CALLBACK (photos_tracker_controller_source_object_added),
+                    self);
+  g_signal_connect (priv->src_mngr,
+                    "object-removed",
+                    G_CALLBACK (photos_tracker_controller_source_object_removed),
+                    self);
+  g_signal_connect (priv->src_mngr,
+                    "active-changed",
+                    G_CALLBACK (photos_tracker_controller_refresh_for_object),
+                    self);
+
+  priv->offset_cntrlr = photos_offset_controller_new ();
+  g_signal_connect (priv->offset_cntrlr,
+                    "offset-changed",
+                    G_CALLBACK (photos_tracker_controller_offset_changed),
+                    self);
+
+  priv->queue = photos_tracker_queue_new ();
+}
+
+
+static void
+photos_tracker_controller_class_init (PhotosTrackerControllerClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->constructor = photos_tracker_controller_constructor;
+  object_class->dispose = photos_tracker_controller_dispose;
+  object_class->finalize = photos_tracker_controller_finalize;
+
+  signals[QUERY_STATUS_CHANGED] = g_signal_new ("query-status-changed",
+                                                G_TYPE_FROM_CLASS (class),
+                                                G_SIGNAL_RUN_LAST,
+                                                G_STRUCT_OFFSET (PhotosTrackerControllerClass,
+                                                                 query_status_changed),
+                                                NULL, /*accumulator */
+                                                NULL, /*accu_data */
+                                                g_cclosure_marshal_VOID__BOOLEAN,
+                                                G_TYPE_NONE,
+                                                1,
+                                                G_TYPE_BOOLEAN);
+
+  g_type_class_add_private (class, sizeof (PhotosTrackerControllerPrivate));
+}
+
+
+PhotosTrackerController *
+photos_tracker_controller_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_TRACKER_CONTROLLER, NULL);
+}
+
+
+void
+photos_tracker_controller_start (PhotosTrackerController *self)
+{
+  PhotosTrackerControllerPrivate *priv = self->priv;
+
+  if (priv->is_started)
+    return;
+
+  photos_tracker_controller_refresh_internal (self, PHOTOS_TRACKER_REFRESH_FLAGS_NONE);
+}
+
+
+gboolean
+photos_tracker_controller_get_query_status (PhotosTrackerController *self)
+{
+  return self->priv->querying;
+}
diff --git a/src/photos-tracker-controller.h b/src/photos-tracker-controller.h
new file mode 100644
index 0000000..c8bb489
--- /dev/null
+++ b/src/photos-tracker-controller.h
@@ -0,0 +1,75 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_TRACKER_CONTROLLER_H
+#define PHOTOS_TRACKER_CONTROLLER_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_TRACKER_CONTROLLER (photos_tracker_controller_get_type ())
+
+#define PHOTOS_TRACKER_CONTROLLER(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_TRACKER_CONTROLLER, PhotosTrackerController))
+
+#define PHOTOS_TRACKER_CONTROLLER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_TRACKER_CONTROLLER, PhotosTrackerControllerClass))
+
+#define PHOTOS_IS_TRACKER_CONTROLLER(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_TRACKER_CONTROLLER))
+
+#define PHOTOS_IS_TRACKER_CONTROLLER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_TRACKER_CONTROLLER))
+
+#define PHOTOS_TRACKER_CONTROLLER_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_TRACKER_CONTROLLER, PhotosTrackerControllerClass))
+
+typedef struct _PhotosTrackerController        PhotosTrackerController;
+typedef struct _PhotosTrackerControllerClass   PhotosTrackerControllerClass;
+typedef struct _PhotosTrackerControllerPrivate PhotosTrackerControllerPrivate;
+
+struct _PhotosTrackerController
+{
+  GObject parent_instance;
+  PhotosTrackerControllerPrivate *priv;
+};
+
+struct _PhotosTrackerControllerClass
+{
+  GObjectClass parent_class;
+
+  void (*query_status_changed) (PhotosTrackerController *self, gboolean querying);
+};
+
+GType                     photos_tracker_controller_get_type          (void) G_GNUC_CONST;
+
+PhotosTrackerController  *photos_tracker_controller_new               (void);
+
+void                      photos_tracker_controller_start             (PhotosTrackerController *self);
+
+G_END_DECLS
+
+#endif /* PHOTOS_TRACKER_CONTROLLER_H */
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